How to disable caching in PHP and browser?

Question

PHP

Good afternoon. In general, I ran into a problem. Please help me figure it out.
There is a profile, there is a settings page. I go to the settings page, make changes, save using php + ajax.
I return to the profile page, and no matter how I reload, until command + shift + r (for windows it's ctrl + r and ctrl + f5), the data on the page is not updated.
Registered in index.php headings, but all the same nothing works.

header("Content-type: text/html");
header("Expires: Mon, 23 Jun 1983 17:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

Please help me figure it out. I don't understand anything.
Also, when I log into my account, a session is written. But the session seems to me there is no sideways at all. Because they work fine, both added and removed.